Upvote:9
Remote working while visiting the UK is explicitly covered in the latest guidance, published Oct 2021.
βVisitors are permitted to undertake activities relating to their employment overseas remotely whilst they are in the UK, such as responding to emails or answering phone calls. However, you should check that the applicantβs main purpose of coming to the UK is to undertake a permitted activity, rather than specifically to work remotely from the UK. Where the applicant indicates that they intend to spend a large proportion of their time in the UK and will be doing some remote working, you should ensure that they are genuinely employed overseas and are not seeking to work in the UK.β
AFAIK (based on the numerous references to it in questions on TSE) it is standard practice for Indian applicants to submit a NOC from their employer when applying for a UK visa. Doing so should help satisfy the final point quoted in the extract from the guidance above. So yes, a NOC is still required.